Boat



A. J. ROWE Aug. 22, 1950 BOAT Filed Dec. 16, 1947 INVENTOR. 6255/?7'Jf/Vaws g flfra Patented Aug. 22, 1950 U N l T ED S TATES PATENT OF 1K111.

BOAT

Albert J. RoWe,'WestIs1ip, N. '.Y

ApplicationDecember 16, 1947, Serial No. 791,964

2 Claims.

This invention relates to the hulls of boats and has special referencesto the design of aboat bottom for moderate and high speedboats.

One object of the invention is to provide a 'boat bottom that willenable the boat to ridelevel on a minimum of wetted surface andtherefore attaining the maximum speed for the amount of horse powerused.

Another object of the invention is that it can be applied to flat,round, semi-round, concave or V bottom hulls. The invention will attainmaximum efficiency in a V bottom, the reason for which will be explainedlater.

It is my theory that objects moving through water and objects movingthrough air encounter resistances and these resistance are fundamentallyidentical except for the differences in their densities.

At around 760 M. P. H. air speed you get into what is known ascompressability which means that the air builds up like a solid wall infront of an airplane. Water has 40 times the density as air, so when youdivide 4.0 into 760 you get 19. Therefore I believe that at speeds above19 M. P. H. an object moving through the water encounters resistancesequal to the ccmpressability encountered by aircraft moving at speeds at760 M. P. H.

In order to get over this state in air, science has found that you haveto go from standard rounded air foils to knife edges (this is where theV bottom works out naturally best because it is knifed from the bow aft)and instead of straight frontal areas on wings and elevators, a 45degree sweep back is best. Thi enables the plane to knife through theair in stages instead of bucking the whole frontal area at once, therebyenabling the lan to get through the compressability stage.

To attain high speeds in boats the boat bottom must ride on the extremesurface of the water because the deeper it rides in the water the morecompressability or resistance it encounters. With my invention the boatbottom lifts itself to the extreme surface and with the 45 degree sweepback it knifes through any compressability or resistance it encountersthe same as modern supersonic aircraft.

With the above facts in mind my invention will enable a boat to: 1.Plane faster. 2. Go the same speed with less power than needed byconventional boats. 3. Go 25% faster than conventional boats with equalpower. 4. Ride on the extreme surface of the water. 5. Ride level.

6. Ride dry at high speeds in rough water.

7. Handle well at any speed.

The means by which this invention enables a boat to attain the aboveclaims are:

1. Plane faster because the stern lifts itself as a result of theforward motion of the boat against (ill the raised stern bottom surface.at 12 to 15 M.-P.H.

v2. .At higher speeds the wetted area is greatly reduced andthe-enginepower is utilized-for for- Ward motion instead .Oif pushing "alot of boat through solid water.

Following isadesoription of the invention with reference to'accompanying drawing showing in Figure 1 aside-elevation and LinFigure2a bottom plan view of the boat, with Figures 3, 4, 5 and 6 showingdiagrammatically the chine lines in relation to bottom lines on theplanes indicated by lines A, B, C and D in Figures 1 and 2.

Figure 1 is a side view and Figure 2 is a bottom View. In Figures 1 and2 the area between stations A and B is the riding area at high speed. InFigure 1 the dotted lines marked W. L. are the water lines. The upperline is when the boat is at rest. The lower line is the riding positionat high speed.

In Figure 2 the area between stations B and C is where the 45 degreelifting area ends and starts. Figure 1 between stations C and D showwhere a slight reentrant curve is. This frees the hull at high speed andpermits it to ride clear of the water from station B all the wayforward. In Figure 2 between stations A and B from the high part of thelifting riding area. at the keel line, the bottom blends into thestraight chine line of the boat.

In Figure 3 are shown the chine lines in relation to the bottom lines. Dand A and B are the same at the keel and A and B both are on the sameplane at the chine and keel while C is higher at the keel due to thereentrant curve shown in Figure 1 between stations 0 and D, but blendsinto the chine line.

Having explained the object of my invention and described its preferredform, it will be seen that the invention will accomplish the following:

1. A boat will be ride level using my invention.

2. Enable a boat to ride on a minimum of wetted surface.

3. To attain more speed for the amount of horse power used.

4. Simplicity of construction.

5. Maintain planing ability despite severe loads.

6. Attain planing position quickly and at lower speeds.

7. Maintain perfect maneuverability and stability at all speeds.

8. By riding high and level, the boat is dry in choppy water.

What I claim is:

1. A quick lifting, low resistance, self-stabilizing, level riding hullof the speed boat type having a bottom with a smooth, non-bulgingplaning surface at the extreme stern section, of short forward extent,approximately less than onethird the water line length, and composed ofsubstantially horizontal extending, flat riding planes at opposite sidesof and joined at the keel line on a slight dihedral angle and joinedwith the midship, forwardly extending section by substantially 45 anglesweepbacks, smoothly blending said forwardly extending section into thedihedral of the planing section without protrusion and thereby affordingknifing and lifting area leading on slightl downward incline smoothlyand continuously into the level riding area afforded by said flat,dihedral planes.

2. A quick lifting, low resistance, self-stabilizing, level riding hullof the speed boat type having a bottom with a smooth, non-bulgingplaning surface at the extreme stern section, of short forward extent,approximately less than one-third the water line length, and composed ofsubstantially horizontal extending, fiat riding planes at opposite sidesof and joined at the keel line on a slight dihedral angle and joinedwith the midship, forwardly extending section by substantially 45 anglesweepbacks, smoothly blending said forwardly extending section into thedihedral of the planing section without protrusion and thereby affordingknifing and lifting area leading on slightly downward incline smoothlyand continuously into the level riding area afforded by said flat,dihedral planes, and said bottom forward of said sweepbacks havingslightly reentrant curved surfaces smoothly merged into said sweepbacks.

ALBERT J. ROWE.

REFERENCES CITED UNITED STATES PATENTS Number Name Date 1,042,636 ApelOct. 29, 1912 1,189,227 Baker July 4, 1916 1,797,252 Wallman Mar. 24,1931 1,880,366 Smedley Oct. 4, 1932 2,369,633 Higgins Feb. 13, 1945FOREIGN PATENTS Number Country Date 515,361 France Nov. 25, 1920

